Early neuromotor behavior in craniosynostotic rabbits

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• Craniosynostosis, the premature fusion of skull sutures, presents complex developmental outcomes in humans.
• Previous studies on craniosynostosis and neurodevelopmental outcomes are confounded by numerous variables.
• A homogeneous rabbit model is utilized to investigate early neuromotor development in craniosynostosis.

Purpose of the Study:

• To characterize early neuromotor development in a rabbit model of craniosynostosis.
• To compare developmental trajectories between rabbits with early-onset and delayed-onset coronal suture synostosis and wild-type controls.

Main Methods:

• Fifty-three newborn rabbits were studied: 13 wild-type, 23 delayed-onset coronal synostosis, and 17 early-onset coronal synostosis.
• Kits were observed daily from birth to 14 days for the emergence of 10 mature behaviors.
• Daily activity levels (grid crossing) and body weights were recorded.

Main Results:

• Significant differences in neuromotor development were observed between groups (p <.05) in 9 of 11 measures.
• Both synostosed groups exhibited significantly accelerated behavioral onset compared to wild-type controls (8 of 9 measures).
• The early-onset synostosis group showed significantly accelerated development compared to the delayed-onset group in 3 of 8 measures.

Conclusions:

• Synostotic rabbits displayed precocious neuromotor development.
• This precocity may be attributed to frontal lobe constrictions and altered brain activity due to increased intracranial pressure.
• Primary genetic effects cannot be excluded as a contributing factor.